IPhone 3GS won't be detected by windows?

I bought and used iPhone 3GS from a friend, but when I turned it on, there's a message that says "iPhone is disabled, connect to iTunes", with the only thing that you can do is emergency call. It also shows a message on the top corner that says NO SIM, I tried to restore it holding the power and home button, but it only shows an image with the iTunes icon and a USB cable. Please help!

Added (1). iTunes does not detect the iPhone either.

An image with the iTunes icon and a USB cable is DFU mode, you need download the firmware and use itunes to restore it, any more question free to ask

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